Piano Chord diagrams using "Keyboard Chord Diagram" font
Occasionally, the request for piano chord diagrams comes up. I came across the Keyboard Chord Diagram font by Jochen Pietsch which enables the user to put in any chord voicing they want:
Once you have installed the font you simply enter "w" or "b" for an unplayed key and "W" or "B" for a played key and use "|" as the end and beginning of a diagram and two separate two adjacent white keys.
So the text for Cmaj7 would be: "|WbwbW|wbWbwbW|"
.. or C13#11 upper-structure (a two hand chord): "|WbwbW|wbWbwBw|wbWbw|wBwbWbw|"
The user might have some minor workflow issues (e.g. use "Lyrics" placement to position chords above staff or use offset to separate the chords from lyrics) but once you have figured these out it works very well.